Meetup for iOS and Android - Discover groups that are all about the things you love
Open Cult - A place for people with common interests to meet IRL.
Conode - A simple editor to organize meetings
Speciface - Instant access to contact information of people nearby
Let's Meetup - An easy way to share POIs and addresses in iMessage
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets